SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
Figure 14-4 shows the CFB mode of operation for encryption and decryption. The input for the crypto core is the IV; the result is XORed with the data. The result is fed back using the IV register, as the next input for the crypto core. The decrypt operation is reversed, but the crypto core is still performing an encryption.